US20070245395A1 - Video reproducing apparatus - Google Patents
Video reproducing apparatus Download PDFInfo
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- US20070245395A1 US20070245395A1 US11/783,698 US78369807A US2007245395A1 US 20070245395 A1 US20070245395 A1 US 20070245395A1 US 78369807 A US78369807 A US 78369807A US 2007245395 A1 US2007245395 A1 US 2007245395A1
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- 238000000034 method Methods 0.000 description 17
- 101000969688 Homo sapiens Macrophage-expressed gene 1 protein Proteins 0.000 description 11
- 102100021285 Macrophage-expressed gene 1 protein Human genes 0.000 description 11
- 238000007906 compression Methods 0.000 description 11
- 230000006835 compression Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 3
- 238000013144 data compression Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44231—Monitoring of peripheral device or external card, e.g. to detect processing problems in a handheld device or the failure of an external recording device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
- H04N21/4435—Memory management
Definitions
- the present invention relates to a video reproducing apparatus, and more specifically to a video reproducing apparatus provided with an external descrambling module.
- FIG. 7 is a block diagram illustrating a configuration of a digital broadcasting receiver as an example of a conventional video reproducing apparatus.
- a video reproducing apparatus 91 shown in FIG. 7 is provided with a tuner 81 , a descrambling card 82 , a transport stream decoder (hereinafter, referred to as “TS decoder”) 83 , a video decoder 84 , and an audio decoder 85 .
- TS decoder transport stream decoder
- the tuner 81 Upon receiving the digital broadcasting signal, the tuner 81 generates a transport stream by demodulating the received digital broadcasting signal, and outputs the generated transport stream to a descrambling card 82 .
- the descrambling card 82 is an external module coupled to the video reproducing apparatus 91 , and descrambles the transport stream outputted from the tuner 81 based on information included in a program map table (hereinafter, referred to as “PMT”) extracted by the TS decoder 83 .
- the video reproducing apparatus 91 outputs the transport stream descrambled by the descrambling card 82 to the TS decoder 83 .
- the TS decoder 83 restores a video packet and an audio packet from the descrambled transport stream, and outputs the restored video packet and the restored audio packet to the video decoder 84 and the audio decoder 85 , respectively.
- the video decoder 84 and the audio decoder 85 restore video data and audio data, respectively, by decoding the packets outputted from the TS decoder 83 .
- the restored video data and the audio data are further converted into a video signal and an audio signal by a following circuit, respectively.
- the converted video signal and the audio signal are outputted from an output device, such as a monitor, a speaker, or the like, and a received program is reproduced.
- FIG. 8A illustrates an example of the program map table used in the video reproducing apparatus shown in FIG. 7 .
- identification numbers 11 through 16 are assigned to six types of data attributes, namely, MPEG1 video, MPEG2 video, MPEGaudio (main-audio), MPEGaudio (sub-audio), AC3 (main-audio), and AC3 (sub-audio)), respectively.
- FIG. 8B illustrates a configuration example of the transport stream.
- the transport stream is composed of a plurality of TS packets each including a packet header and a payload.
- An identifier for indicating the data attribute included in the payload is set in each of the packet headers of the TS packet.
- a correspondence relation between the identifier and the data attribute included in the TS packet is the same as that defined in the PMT shown in FIG. 8A .
- FIG. 9 is a flow chart illustrating a descrambling process executed in the video reproducing apparatus shown in FIG. 7 .
- the descrambling card 82 acquires PMT from the TS decoder 83 (Step S 902 ).
- the descrambling card 82 executes a descrambling process for a packet containing an identification number defined in the acquired PMT in the packet header thereof (Step S 903 ).
- the descrambling card 82 outputs the transport stream containing the descrambled packet to the TS decoder 83 .
- the video packet and the audio packet restored by the TS decoder 83 are reproduced by the video decoder 84 and the audio decoder 85 , respectively (Step S 904 ).
- a certain descrambling card has a limit to the number of types of packets which can be simultaneously descrambled.
- the descrambling card simultaneously descrambles packets within the limit and output the descrambled packets to the TS decoder, while outputting packets having types which are out of the limit to the TS decoder without descrambling them.
- the descrambling card 82 shown in FIG. 7 can simultaneously descramble three types of packets.
- the descrambling card 82 upon receiving the transport stream shown in FIG. 8B (namely, the transport stream containing six types of packets), the descrambling card 82 simultaneously descrambles only three types of packets, for example, MPEG2 video, MPEG1 video, and MPEG audio (main).
- MPEG audio (sub-audio), AC3 (main-audio), and AC3 (sub-audio) packets are transmitted to the TS decoder 83 while they are scrambled.
- the limit to the types of packet which can be simultaneously descrambled is provided with the descrambling card, as constraints of capability.
- the conventional video reproducing apparatus that utilizes such a descrambling card there are following problems.
- the transport stream contains both of a packet that the video decoder or the audio decoder included in the video reproducing apparatus can reproduce and a packet that they cannot reproduce.
- the conventional video reproducing apparatus instructs the descrambling card to descramble the scrambled transport stream without relation to the type of packet that the video decoder and the audio decoder can reproduce.
- the descrambling card descrambles packets which cannot be reproduced in the video decoder nor the audio decoder, thereby narrowing room for descrambling the required packets.
- the conventional video reproducing apparatus instructs the descrambling card to descramble the code thereof without whether a packet composes the desired program.
- the descrambling card descrambles a packet other than the packets that compose the desired program, and thus there is a possibility that the packets that compose the desired program may not be descrambled.
- the conventional video reproducing apparatus instructs the descrambling card to descramble the packet which does not need to be descrambled, if the descrambling card receives the transport stream containing a plurality of types of packets exceeding the limit of the card, resources of the descrambling card for descrambling the required packets run short, and thus, there has been a problem that a video and an audio desired by the viewer could not be reproduced.
- the present invention relates to a video reproducing apparatus for reproducing video data contained in an input signal in which a plurality of packets are multiplexed, which is coupled to a descrambling processing unit which descrambles a scrambled first bit stream in accordance with an externally inputted instruction and outputs a second bit stream which is generated by descrambling at least a part of the first bit stream has been descrambled.
- the video reproducing apparatus is provided with a tuner section for receiving the input signal to convert the received input signal into the first bit stream and outputting the first bit stream to the descrambling processing unit, a data input/output section for receiving the second bit stream outputted from the descrambling processing unit and outputting a packet contained in the second bit stream, a video reproduction section for reproducing the video data contained in the packet outputted from the data input/output section, and a descrambling instruction section for informing the descrambling processing unit of a data format of a packet to be descrambled among the packets contained in the first bit stream.
- the descrambling card preferentially descrambles the packet instructed from the descrambling instruction section, it is possible to achieve the video reproducing apparatus, which allows the viewer to watch and listen to the video and the audio that the viewer desires even when the descrambling card has a limit to the number of types of packet which can be simultaneously descrambled.
- FIG. 1 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a first embodiment of the present invention
- FIG. 2 is a flow chart illustrating an example of a descrambling process executed in the video reproducing apparatus shown in FIG. 1 ;
- FIG. 3A is a view illustrating an example of PMT processed by a PMT processing section shown in FIG. 1 ;
- FIG. 3B is a view illustrating an example of a transport stream received by a descrambling card
- FIG. 4 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a second embodiment of the present invention
- FIG. 5 is a flow chart illustrating an example of a descrambling process executed in the video reproducing apparatus shown in FIG. 4 ;
- FIG. 6A is a view illustrating an example of PMT processed by a PMT processing section shown in FIG. 4 ;
- FIG. 6B is a view illustrating an example of a transport stream received by a descrambling card
- FIG. 7 is a block diagram illustrating a configuration of a digital broadcasting receiver as an example of a conventional video reproducing apparatus
- FIG. 8A is a view illustrating an example of a program map table used in the video reproducing apparatus shown in FIG. 7 ;
- FIG. 8B is a view illustrating a configuration example of a transport stream.
- FIG. 9 is a flow chart illustrating a descrambling process executed in the video reproducing apparatus shown in FIG. 7 .
- FIG. 1 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a first embodiment of the present invention.
- a video reproducing apparatus 11 shown in FIG. 1 includes a tuner 1 , a transport stream decoder (hereinafter, referred to as “TS decoder”) 3 , a video decoder 4 , an audio decoder 5 , and a program map table processing section (hereinafter, referred to as “PMT processing section”) 6 .
- the video reproducing apparatus 11 is provided with a descrambling card 2 which functions as an external descrambling processing unit.
- the tuner 1 receives a digital broadcasting signal, as an input signal, from an antenna or a cable, and performs a demodulation processing, an error correction processing, or the like to the received digital broadcasting signal. In addition, the tuner 1 generates a transport stream TSs from the received digital broadcasting signal, and outputs the generated transport stream TSs to the descrambling card 2 .
- the transport stream is a bit stream composed of a plurality of packets containing various kinds of data used for a digital broadcasting.
- the descrambling card 2 is an external module, which is attached to the video reproducing apparatus 11 , as the descrambling processing unit.
- the descrambling card 2 descrambles the transport stream TSs according to an external instruction (instruction from the PMT processing section 6 described later), and generates a descrambled transport stream TSd.
- the descrambling card 2 outputs the generated transport stream TSd to the TS decoder 3 .
- the TS decoder 3 restores a video packet Pv and an audio packet Pa from the descrambled transport stream TSd, and outputs the video packet Pv and the audio packet Pa to the video decoder 4 and the audio decoder 5 , respectively.
- the TS decoder 3 extracts a program map table (hereinafter, referred to as “PMT”), in which a data attribute contained in a payload of the TS packet and a unique identification number are associated with each other, from the scrambled transport stream TSs.
- PMT program map table
- the TS decoder 3 in the present embodiment corresponds to a data input/output section for receiving the transport stream TSd outputted from the descrambling card 2 and outputting the packet contained in the transport stream TSd.
- the video decoder 4 restores the video data by decoding the video packet Pv outputted from the TS decoder 3 , and outputs the restored video data to a following circuit or the like.
- the video data is converted into a video signal by the following circuit or the like and then is outputted from an output device, such as a monitor, as a video image.
- the audio decoder 5 restores the audio data by decoding the audio packet Pa outputted from the TS decoder 3 , and outputs the restored audio data to a following circuit or the like.
- the audio data is converted into an audio signal by the following circuit or the like and then is outputted from an output device, such as a loudspeaker, as an audio sound.
- the PMT processing section 6 acquires PMT information Ipmt which is extracted by the TS decoder 3 , and after processing the acquired PMT information Ipmt, it outputs the processed PMT information IMpmt to the descrambling card 2 . More specifically, the PMT processing section 6 previously stores the identification number of the data attribute (data compression format) that the video decoder 4 and the audio decoder 5 can decode, and extracts only data specified by the previously-stored identification number among the pieces of acquired PMT information Ipmt. The PMT processing section 6 generates the processed PMT information IMpmt containing only the extracted data, and outputs the processed PMT information IMpmt to the descrambling card 2 .
- the PMT processing section 6 in accordance with the present embodiment corresponds to a descrambling instruction section for instructing the data format of the packet to be descrambled among the packets contained in the transport stream TSs to the descrambling card 2 .
- a method for previously storing into the PMT processing section 6 the data attribute that the video decoder 4 and the audio decoder 5 can decode is not limited in particular. As one example, it may be possible to store in advance the data attribute in the PMT processing section 6 during manufacturing the video reproducing apparatus 11 based on a specification of the video decoder 4 and the audio decoder 5 . Alternatively, as another example, a storage medium, such as a non-volatile memory or the like which the PMT processing section 6 can refer to and rewrite is prepared, and the data attribute that the video decoder 4 and the audio decoder 5 can decode may be set by externally inputting a signal or the like.
- FIG. 2 is a flow chart illustrating an example of a descrambling process executed in the video reproducing apparatus 11 shown in FIG. 1 .
- the PMT processing section 6 processes PMT (Step S 101 ). More specifically, the PMT processing section 6 acquires the PMT information Ipmt which is extracted by the TS decoder 3 from the transport stream TSs containing scrambled packets, and extracts only information on a compressed format that the video decoder 4 and the audio decoder 5 can reproduce, from the acquired PMT information Ipmt by deleting information on the data attribute that the video decoder 4 and the audio decoder 5 cannot reproduce based on the identification number stored in advance.
- the descrambling card 2 acquires the processed PMT information IMpmt from the PMT processing section 6 (Step S 103 ).
- the descrambling card 2 executes the descrambling process for the packet containing the identification number defined in the acquired processed PMT information IMpmt in the packet header thereof (Step S 104 ).
- the descrambling card 2 outputs the transport stream TSd containing the descrambled packet to the TS decoder 3 .
- the video packet Pv and the audio packet Pa restored by the TS decoder 3 are reproduced by the video decoder 4 and the audio decoder 5 , respectively (Step S 105 ).
- Step S 101 at which the PMT processing section 6 processes PMT is executed each time the PMT, which is contained in the transport stream and is to be extracted by the TS decoder 3 , changes.
- FIG. 3A is a view illustrating an example of PMT processed by the PMT processing section 6 shown in FIG. 1 .
- the PMT processing section 6 previously stores a video compression format that the video decoder 4 can reproduce and an audio compression format that the audio decoder 5 can reproduce.
- a video compression format that the video decoder 4 can reproduce and an audio compression format that the audio decoder 5 can reproduce.
- the video decoder 4 shown in FIG. 1 can reproduce MPEG2 video
- the audio decoder 5 shown in FIG. 1 can reproduce AC3 audio.
- the PMT processing section 6 deletes information on MPEG1 video that the video decoder 4 cannot reproduce and information on MPEG audio that the audio decoder 5 cannot reproduce among the pieces of PMT information acquired from the TS decoder 3 .
- the PMT processing section 6 extracts the information on MPEG2 video that the video decoder 4 can reproduce and the information on AC3 that the audio decoder 5 can reproduce among the pieces of PMT information Ipmt, and generates the processed PMT information IMpmt.
- the processed PMT information IMpmt As shown in FIG. 3 , three types of attributes, i.e., MPEG2 video, AC3 (main-audio), and AC3 (sub-audio), which are associated with identification numbers 12 , 15 , and 16 , respectively, are defined in the processed PMT information IMpmt as shown in FIG. 3A .
- the processed PMT information IMpmt indicates that the descrambling process is to be executed by the descrambling card 2 with respect to packets having these three types of attributes.
- FIG. 3B is a view illustrating an example of the transport stream received by the descrambling card.
- TS packets which have identification numbers 11 through 13 , 15 , and 16 in the packet header, respectively, are contained in the transport stream TSs shown in FIG. 3B .
- the identification number 11 Video 1 [MPEG1 video]
- the identification number 13 Audio 1 [MPEG Audio (main)]
- the descrambling card 2 has received from the PMT processing section 6 .
- the descrambling card 2 descrambles the TS packets having the identification numbers 12 , 15 , and 16 among five types of TS packets contained in the transport stream TSs and then outputs the descrambled packets, it outputs scrambled packets having the identification numbers 11 or 13 as they are scrambled.
- the descrambling card 2 has a capability of simultaneously descrambling three types of packets and a program desired by a viewer is composed of MPEG2video and AC3 audio.
- the conventional video reproducing apparatus instructs the descrambling card to descramble the packet containing the data of, for example, MPEG2 video, MPEG1 video, and MPEG audio (main), regardless of the packet type that the video decoder and the audio decoder can reproduce.
- the conventional video reproducing apparatus since the conventional video reproducing apparatus outputs the packet containing the data of MPEG audio (sub-audio), AC3 (main-audio), and AC3 (sub-audio) as they are scrambled, AC3 (main-audio) and AC3 (sub-audio) desired by the viewer are not reproduced.
- resources of the descrambling card are not necessarily allocated for descrambling the packet that the video decoder and the audio decoder can reproduce.
- the PMT processing section 6 instructs the descrambling card 2 to descramble the packet that the video decoder 4 and the audio decoder 5 can reproduce.
- the video reproducing apparatus 11 of the present embodiment it is possible to effectively utilize the resources of the descrambling card 2 for descrambling the required packet, thereby allowing the packets of MPEG2 video, AC3 (main-audio), and AC3 (sub-audio), which are playable for the apparatus, to be preferentially descrambled.
- the PMT processing section 6 similarly creates the processed PMT information IMpmt containing only the information on MPEG1 video by deleting the information on MPEG2 video from the PMT information Ipmt.
- the PMT processing section 6 may create the processed IMpmt containing only the information on MPEG audio by deleting the information on AC3 from the PMT information Ipmt.
- FIG. 4 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a second embodiment of the present invention.
- the video reproducing apparatus 12 of the present embodiment is different from that of the first embodiment in that the apparatus further include a packet selection instructing section 7 .
- the packet selection instructing section 7 receives selection information Is including the video and audio compression formats of the program that the viewer desires to watch and listen to. Based on the received selection information Is, the packet selection instructing section 7 outputs to the PMT processing section 6 a command Cs for specifying a packet to be descrambled, and outputs to the TS decoder 3 a command Ce including the type of packet to be extracted from the descrambled transport stream TSd.
- the selection information Is may be supplied from a device outside the video reproducing apparatus 12 , or may be supplied from any component in the video reproducing apparatus 12 .
- the TS decoder 3 extracts the packets from the transport stream TSd received from the descrambling card 2 , and outputs the extracted packets to the video decoder 4 or the audio decoder 5 .
- FIG. 5 is a flow chart illustrating an example of the descrambling process executed in the video reproducing apparatus shown in FIG. 4 .
- the packet selection instructing section 7 outputs the command Cs for specifying the packet to be descrambled to the PMT processing section 6 (Step S 201 ).
- the PMT processing section 6 processes PMT based on the command Cs from the packet selection instructing section 7 . More specifically, the PMT processing section 6 acquires the PMT information Ipmt which is extracted by the TS decoder 3 from the transport stream TSs containing scrambled packets, and extracts only information on the compression format specified by the packet selection instructing section 7 from the acquired PMT information Ipmt based on the identification number stored in advance.
- the descrambling card 2 acquires the processed PMT information IMpmt from the PMT processing section 6 (Step S 203 ).
- the descrambling card 2 executes the descrambling process for the packet containing the identification number defined in the acquired processed PMT information IMpmt in the packet header thereof (Step S 204 ).
- the descrambling card 2 outputs the transport stream TSd containing the descrambled packet to the TS decoder 3 .
- the video packet Pv and the audio packet Pa outputted from the TS decoder 3 are reproduced by the video decoder 4 and the audio decoder 5 , respectively (Step S 205 ).
- FIG. 6A is a view illustrating an example of PMT processed by the PMT processing section 6 shown in FIG. 4 .
- the descrambling card 2 has a capability of simultaneously descrambling two types of packets and where a program desired by the viewer is composed of MPEG2 video and AC3 audio. Additionally, it is assumed a case where the program desired by the viewer is composed of data of MPEG2 video and AC3 (sub).
- the packet selection instructing section 7 receives the selection information Is containing the video and audio compression formats of the program that the viewer desires to watch and listen to, and outputs to the PMT processing section 6 the command Cs for selecting the data compression formats (MPEG2 video and AC3 (sub)) indicated in the received selection information Is.
- the PMT processing section 6 acquires the PMT information Ipmt from the TS decoder 3 , and extracts the information on MPEG2 video and AC3 (sub), specified by the packet selection instructing section 7 , from the acquired PMT information and generates the processed PMT information IMpmt.
- the processed PMT information IMpmt indicates that the descrambling process is executed by the descrambling card 2 with respect to two types of packets.
- FIG. 6B is a view illustrating an example of the transport stream received by the descrambling card.
- the transport stream TSs shown in FIG. 6B contains five types of TS packets each having respective the identification numbers 11 through 13 , 15 , and 16 in the packet header.
- FIG. 6A only identification numbers 12 and 16 are specified in the processed PMT information IMpmt that the descrambling card 2 has received from the PMT processing section 6 .
- the descrambling card 2 descrambles the TS packets having the identification numbers 12 and 16 and outputs the descrambled packets, it outputs scrambled packets having the identification numbers 11 and 13 as they are.
- the conventional video reproducing apparatus instructs the descrambling card to descramble the packet regardless of whether the packets compose the program desired by the viewer, there is a case where the scrambled packets containing, for example the data of AC3 (main-audio) and the data of AC3 (sub-audio) is outputted as they are. In this case, the conventional video reproducing apparatus cannot reproduce the audio data (AC3 (main-audio) and AC3 (sub-audio)) of the program that the viewer has desired. In other words, in the conventional video reproducing apparatus, the resources of the descrambling card is not necessarily allocated for descrambling the packet having the data attribute that the viewer desires to reproduce.
- the packet selection instructing section 7 receives the selection information Is for selecting MPEG2 video, AC3 (main-audio), and AC3 (sub-audio) desired by the viewer, and the PMT processing section 6 instructs the descrambling card 2 to descramble the packet informed by the packet selection instructing section 7 .
- the video reproducing apparatus 12 of the present embodiment it is possible to effectively utilize the resources of the descrambling card 2 for descrambling the required packet, thereby allowing the packets having the audio data (AC3 (main-audio) and AC3 (sub-audio)) of the program, which are desired by the viewer, to be preferentially descrambled.
- the program, that the viewer desires to watch and listen to is composed of MPEG2 video and AC3.
- the program, that the viewer desires to watch and listen to is composed of MPEG1 video and MPEG audio
- the video compression format that the video decoder 4 can reproduce is MPEG1 video
- the audio compression format that the audio decoder 5 can reproduce is MPEG audio
- the packet selection instructing section 7 may output the command Cs to the PMT processing section 6 to select the packets of MPEG1 video and MPEG audio (main). Also in this case, the viewer can watch and listen to MPEG1 video and MPEG audio (main).
- the present invention can achieve the video reproducing apparatus allowing the viewer to watch and listen to the video and the audio of the desired program even in the case where the descrambling card has a limit to the number of types of packet which can be simultaneously descrambled.
- the present invention can be applied to an apparatus for receiving a digital video signal, for example, a digital broadcasting receiver, a set top box, a video cassette recorder, a DVD recorder, or the like.
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Abstract
Description
- 1. Field of the Invention
- The present invention relates to a video reproducing apparatus, and more specifically to a video reproducing apparatus provided with an external descrambling module.
- 2. Description of the Background Art
- Conventionally, as for a video reproducing apparatus provided with an external descrambling module, an interface between the external module and the video reproducing apparatus is described in a specification of an open cable, which is a North American Standard specification, (for example, refer to “ANSI SCTE282003DVS295 (American National Standard Institute (ANSI)”).
-
FIG. 7 is a block diagram illustrating a configuration of a digital broadcasting receiver as an example of a conventional video reproducing apparatus. - A
video reproducing apparatus 91 shown inFIG. 7 is provided with atuner 81, adescrambling card 82, a transport stream decoder (hereinafter, referred to as “TS decoder”) 83, avideo decoder 84, and anaudio decoder 85. - Upon receiving the digital broadcasting signal, the
tuner 81 generates a transport stream by demodulating the received digital broadcasting signal, and outputs the generated transport stream to adescrambling card 82. - The
descrambling card 82 is an external module coupled to thevideo reproducing apparatus 91, and descrambles the transport stream outputted from thetuner 81 based on information included in a program map table (hereinafter, referred to as “PMT”) extracted by theTS decoder 83. Thevideo reproducing apparatus 91 outputs the transport stream descrambled by thedescrambling card 82 to theTS decoder 83. - The
TS decoder 83 restores a video packet and an audio packet from the descrambled transport stream, and outputs the restored video packet and the restored audio packet to thevideo decoder 84 and theaudio decoder 85, respectively. - The
video decoder 84 and theaudio decoder 85 restore video data and audio data, respectively, by decoding the packets outputted from theTS decoder 83. The restored video data and the audio data are further converted into a video signal and an audio signal by a following circuit, respectively. The converted video signal and the audio signal are outputted from an output device, such as a monitor, a speaker, or the like, and a received program is reproduced. -
FIG. 8A illustrates an example of the program map table used in the video reproducing apparatus shown inFIG. 7 . - Information in which a data attribute (data format) contained in a TS packet and an identification number for identifying the data attribute are associated with each other is defined in the program map table. For example, in an example shown in
FIG. 8A ,identification numbers 11 through 16 are assigned to six types of data attributes, namely, MPEG1 video, MPEG2 video, MPEGaudio (main-audio), MPEGaudio (sub-audio), AC3 (main-audio), and AC3 (sub-audio)), respectively. -
FIG. 8B illustrates a configuration example of the transport stream. - The transport stream is composed of a plurality of TS packets each including a packet header and a payload. An identifier for indicating the data attribute included in the payload is set in each of the packet headers of the TS packet. A correspondence relation between the identifier and the data attribute included in the TS packet is the same as that defined in the PMT shown in
FIG. 8A . -
FIG. 9 is a flow chart illustrating a descrambling process executed in the video reproducing apparatus shown inFIG. 7 . - First, when the scrambled video data is inputted into the
descrambling card 82 from the tuner 81 (Step S901), thedescrambling card 82 acquires PMT from the TS decoder 83 (Step S902). - Next, the
descrambling card 82 executes a descrambling process for a packet containing an identification number defined in the acquired PMT in the packet header thereof (Step S903). Thedescrambling card 82 outputs the transport stream containing the descrambled packet to theTS decoder 83. - The video packet and the audio packet restored by the
TS decoder 83 are reproduced by thevideo decoder 84 and theaudio decoder 85, respectively (Step S904). - However, as constraints of throughput, a certain descrambling card has a limit to the number of types of packets which can be simultaneously descrambled. In this case, the descrambling card simultaneously descrambles packets within the limit and output the descrambled packets to the TS decoder, while outputting packets having types which are out of the limit to the TS decoder without descrambling them.
- For example, it is assumed a case where the
descrambling card 82 shown inFIG. 7 can simultaneously descramble three types of packets. In this case, upon receiving the transport stream shown inFIG. 8B (namely, the transport stream containing six types of packets), thedescrambling card 82 simultaneously descrambles only three types of packets, for example, MPEG2 video, MPEG1 video, and MPEG audio (main). In this case, MPEG audio (sub-audio), AC3 (main-audio), and AC3 (sub-audio) packets are transmitted to theTS decoder 83 while they are scrambled. - Another document relevant to the above-mentioned technology includes, for example, “CableCARD (TM) Interface 2.0 Specification (CableLabs, U.S., Nov. 17, 2005, OC-SP-CCIF2.0-I03-051117, pp. 104-106).
- As described above, the limit to the types of packet which can be simultaneously descrambled is provided with the descrambling card, as constraints of capability. In the conventional video reproducing apparatus that utilizes such a descrambling card, there are following problems.
- First, there may be a case where the transport stream contains both of a packet that the video decoder or the audio decoder included in the video reproducing apparatus can reproduce and a packet that they cannot reproduce. The conventional video reproducing apparatus instructs the descrambling card to descramble the scrambled transport stream without relation to the type of packet that the video decoder and the audio decoder can reproduce. As a result, when the capability of the descrambling card is limited, the descrambling card descrambles packets which cannot be reproduced in the video decoder nor the audio decoder, thereby narrowing room for descrambling the required packets.
- Second, there may be a case where a program that a viewer desires to watch and listen to is composed of video data and audio data in a predetermined data format. The conventional video reproducing apparatus instructs the descrambling card to descramble the code thereof without whether a packet composes the desired program. As a result, the capability of the descrambling card is limited, the descrambling card descrambles a packet other than the packets that compose the desired program, and thus there is a possibility that the packets that compose the desired program may not be descrambled.
- In either case described above, since the conventional video reproducing apparatus instructs the descrambling card to descramble the packet which does not need to be descrambled, if the descrambling card receives the transport stream containing a plurality of types of packets exceeding the limit of the card, resources of the descrambling card for descrambling the required packets run short, and thus, there has been a problem that a video and an audio desired by the viewer could not be reproduced.
- Therefore, it is an object of the present invention to provide a video reproducing apparatus which can reproduce a video and an audio desired by a viewer, even when the number of types of packet that a descrambling card can simultaneously descramble is limited.
- The present invention relates to a video reproducing apparatus for reproducing video data contained in an input signal in which a plurality of packets are multiplexed, which is coupled to a descrambling processing unit which descrambles a scrambled first bit stream in accordance with an externally inputted instruction and outputs a second bit stream which is generated by descrambling at least a part of the first bit stream has been descrambled. The video reproducing apparatus is provided with a tuner section for receiving the input signal to convert the received input signal into the first bit stream and outputting the first bit stream to the descrambling processing unit, a data input/output section for receiving the second bit stream outputted from the descrambling processing unit and outputting a packet contained in the second bit stream, a video reproduction section for reproducing the video data contained in the packet outputted from the data input/output section, and a descrambling instruction section for informing the descrambling processing unit of a data format of a packet to be descrambled among the packets contained in the first bit stream.
- According to the present invention, since the descrambling card preferentially descrambles the packet instructed from the descrambling instruction section, it is possible to achieve the video reproducing apparatus, which allows the viewer to watch and listen to the video and the audio that the viewer desires even when the descrambling card has a limit to the number of types of packet which can be simultaneously descrambled.
- These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
-
FIG. 1 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a first embodiment of the present invention; -
FIG. 2 is a flow chart illustrating an example of a descrambling process executed in the video reproducing apparatus shown inFIG. 1 ; -
FIG. 3A is a view illustrating an example of PMT processed by a PMT processing section shown inFIG. 1 ; -
FIG. 3B is a view illustrating an example of a transport stream received by a descrambling card; -
FIG. 4 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a second embodiment of the present invention; -
FIG. 5 is a flow chart illustrating an example of a descrambling process executed in the video reproducing apparatus shown inFIG. 4 ; -
FIG. 6A is a view illustrating an example of PMT processed by a PMT processing section shown inFIG. 4 ; -
FIG. 6B is a view illustrating an example of a transport stream received by a descrambling card; -
FIG. 7 is a block diagram illustrating a configuration of a digital broadcasting receiver as an example of a conventional video reproducing apparatus; -
FIG. 8A is a view illustrating an example of a program map table used in the video reproducing apparatus shown inFIG. 7 ; -
FIG. 8B is a view illustrating a configuration example of a transport stream; and -
FIG. 9 is a flow chart illustrating a descrambling process executed in the video reproducing apparatus shown inFIG. 7 . - Hereinafter, a video reproducing apparatus in accordance with each embodiment of the present invention will be described in detail with reference to the drawings. As an example, the video reproducing apparatus in accordance with following each embodiment is achieved as a digital broadcasting receiver.
-
FIG. 1 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a first embodiment of the present invention. - A
video reproducing apparatus 11 shown inFIG. 1 includes atuner 1, a transport stream decoder (hereinafter, referred to as “TS decoder”) 3, avideo decoder 4, anaudio decoder 5, and a program map table processing section (hereinafter, referred to as “PMT processing section”) 6. Thevideo reproducing apparatus 11 is provided with adescrambling card 2 which functions as an external descrambling processing unit. - The
tuner 1 receives a digital broadcasting signal, as an input signal, from an antenna or a cable, and performs a demodulation processing, an error correction processing, or the like to the received digital broadcasting signal. In addition, thetuner 1 generates a transport stream TSs from the received digital broadcasting signal, and outputs the generated transport stream TSs to thedescrambling card 2. The transport stream is a bit stream composed of a plurality of packets containing various kinds of data used for a digital broadcasting. - The
descrambling card 2 is an external module, which is attached to thevideo reproducing apparatus 11, as the descrambling processing unit. Thedescrambling card 2 descrambles the transport stream TSs according to an external instruction (instruction from thePMT processing section 6 described later), and generates a descrambled transport stream TSd. Thedescrambling card 2 outputs the generated transport stream TSd to theTS decoder 3. - The
TS decoder 3 restores a video packet Pv and an audio packet Pa from the descrambled transport stream TSd, and outputs the video packet Pv and the audio packet Pa to thevideo decoder 4 and theaudio decoder 5, respectively. In addition, theTS decoder 3 extracts a program map table (hereinafter, referred to as “PMT”), in which a data attribute contained in a payload of the TS packet and a unique identification number are associated with each other, from the scrambled transport stream TSs. TheTS decoder 3 in the present embodiment corresponds to a data input/output section for receiving the transport stream TSd outputted from thedescrambling card 2 and outputting the packet contained in the transport stream TSd. - The
video decoder 4 restores the video data by decoding the video packet Pv outputted from theTS decoder 3, and outputs the restored video data to a following circuit or the like. The video data is converted into a video signal by the following circuit or the like and then is outputted from an output device, such as a monitor, as a video image. - Similarly, the
audio decoder 5 restores the audio data by decoding the audio packet Pa outputted from theTS decoder 3, and outputs the restored audio data to a following circuit or the like. The audio data is converted into an audio signal by the following circuit or the like and then is outputted from an output device, such as a loudspeaker, as an audio sound. - The
PMT processing section 6 acquires PMT information Ipmt which is extracted by theTS decoder 3, and after processing the acquired PMT information Ipmt, it outputs the processed PMT information IMpmt to thedescrambling card 2. More specifically, thePMT processing section 6 previously stores the identification number of the data attribute (data compression format) that thevideo decoder 4 and theaudio decoder 5 can decode, and extracts only data specified by the previously-stored identification number among the pieces of acquired PMT information Ipmt. ThePMT processing section 6 generates the processed PMT information IMpmt containing only the extracted data, and outputs the processed PMT information IMpmt to thedescrambling card 2. ThePMT processing section 6 in accordance with the present embodiment corresponds to a descrambling instruction section for instructing the data format of the packet to be descrambled among the packets contained in the transport stream TSs to thedescrambling card 2. - Note that a method for previously storing into the
PMT processing section 6 the data attribute that thevideo decoder 4 and theaudio decoder 5 can decode is not limited in particular. As one example, it may be possible to store in advance the data attribute in thePMT processing section 6 during manufacturing thevideo reproducing apparatus 11 based on a specification of thevideo decoder 4 and theaudio decoder 5. Alternatively, as another example, a storage medium, such as a non-volatile memory or the like which thePMT processing section 6 can refer to and rewrite is prepared, and the data attribute that thevideo decoder 4 and theaudio decoder 5 can decode may be set by externally inputting a signal or the like. -
FIG. 2 is a flow chart illustrating an example of a descrambling process executed in thevideo reproducing apparatus 11 shown inFIG. 1 . - First, the
PMT processing section 6 processes PMT (Step S101). More specifically, thePMT processing section 6 acquires the PMT information Ipmt which is extracted by theTS decoder 3 from the transport stream TSs containing scrambled packets, and extracts only information on a compressed format that thevideo decoder 4 and theaudio decoder 5 can reproduce, from the acquired PMT information Ipmt by deleting information on the data attribute that thevideo decoder 4 and theaudio decoder 5 cannot reproduce based on the identification number stored in advance. - Next, when the scrambled transport stream TSs is imputed to
descrambling card 2 from the tuner 1 (Step S102), thedescrambling card 2 acquires the processed PMT information IMpmt from the PMT processing section 6 (Step S103). - Next, the
descrambling card 2 executes the descrambling process for the packet containing the identification number defined in the acquired processed PMT information IMpmt in the packet header thereof (Step S104). Thedescrambling card 2 outputs the transport stream TSd containing the descrambled packet to theTS decoder 3. - The video packet Pv and the audio packet Pa restored by the
TS decoder 3 are reproduced by thevideo decoder 4 and theaudio decoder 5, respectively (Step S105). - In
FIG. 2 , Step S101 at which thePMT processing section 6 processes PMT is executed each time the PMT, which is contained in the transport stream and is to be extracted by theTS decoder 3, changes. - Hereinafter, an example of a process of the
PMT processing section 6 will be further described with reference toFIG. 3A andFIG. 3B . -
FIG. 3A is a view illustrating an example of PMT processed by thePMT processing section 6 shown inFIG. 1 . - As described above, the
PMT processing section 6 previously stores a video compression format that thevideo decoder 4 can reproduce and an audio compression format that theaudio decoder 5 can reproduce. Hereinafter, for the purpose of simplification, it is assumed a case where thevideo decoder 4 shown inFIG. 1 can reproduce MPEG2 video and theaudio decoder 5 shown inFIG. 1 can reproduce AC3 audio. - The
PMT processing section 6 deletes information on MPEG1 video that thevideo decoder 4 cannot reproduce and information on MPEG audio that theaudio decoder 5 cannot reproduce among the pieces of PMT information acquired from theTS decoder 3. In other words, thePMT processing section 6 extracts the information on MPEG2 video that thevideo decoder 4 can reproduce and the information on AC3 that theaudio decoder 5 can reproduce among the pieces of PMT information Ipmt, and generates the processed PMT information IMpmt. - As shown in
FIG. 3 , three types of attributes, i.e., MPEG2 video, AC3 (main-audio), and AC3 (sub-audio), which are associated withidentification numbers FIG. 3A . The processed PMT information IMpmt indicates that the descrambling process is to be executed by thedescrambling card 2 with respect to packets having these three types of attributes. -
FIG. 3B is a view illustrating an example of the transport stream received by the descrambling card. - Five types of TS packets, which have
identification numbers 11 through 13, 15, and 16 in the packet header, respectively, are contained in the transport stream TSs shown inFIG. 3B . As shown inFIG. 3A , the identification number 11 (Video 1 [MPEG1 video]) and the identification number 13 (Audio1 [MPEG Audio (main)]) are not defined in the processed PMT information IMpmt that thedescrambling card 2 has received from thePMT processing section 6. - As a result, although the
descrambling card 2 descrambles the TS packets having theidentification numbers identification numbers - Here, it is further assumed a case where the
descrambling card 2 has a capability of simultaneously descrambling three types of packets and a program desired by a viewer is composed of MPEG2video and AC3 audio. - The conventional video reproducing apparatus instructs the descrambling card to descramble the packet containing the data of, for example, MPEG2 video, MPEG1 video, and MPEG audio (main), regardless of the packet type that the video decoder and the audio decoder can reproduce. In this case, since the conventional video reproducing apparatus outputs the packet containing the data of MPEG audio (sub-audio), AC3 (main-audio), and AC3 (sub-audio) as they are scrambled, AC3 (main-audio) and AC3 (sub-audio) desired by the viewer are not reproduced. In other words, in the conventional video reproducing apparatus, there may be a case where resources of the descrambling card are not necessarily allocated for descrambling the packet that the video decoder and the audio decoder can reproduce.
- In contrast to this, in the
video reproducing apparatus 11 in accordance with the present embodiment, thePMT processing section 6 instructs thedescrambling card 2 to descramble the packet that thevideo decoder 4 and theaudio decoder 5 can reproduce. As a result, according to thevideo reproducing apparatus 11 of the present embodiment, it is possible to effectively utilize the resources of thedescrambling card 2 for descrambling the required packet, thereby allowing the packets of MPEG2 video, AC3 (main-audio), and AC3 (sub-audio), which are playable for the apparatus, to be preferentially descrambled. - In the present embodiment, a case where the video compression format that the
video decoder 4 can reproduce is MPEG2 video and the audio compression format that theaudio decoder 5 can reproduce is AC3 format is described. If the video compression format that thevideo decoder 4 can reproduce is only MPEG1 video and thevideo decoder 4 cannot reproduce MPEG2 video, thePMT processing section 6 similarly creates the processed PMT information IMpmt containing only the information on MPEG1 video by deleting the information on MPEG2 video from the PMT information Ipmt. In addition, if the audio compression format that theaudio decoder 5 can reproduce is only MPEG audio, thePMT processing section 6 may create the processed IMpmt containing only the information on MPEG audio by deleting the information on AC3 from the PMT information Ipmt. -
FIG. 4 is a block diagram illustrating a schematic configuration of a video reproducing apparatus in accordance with a second embodiment of the present invention. - Since a configuration of a
video reproducing apparatus 12 of the second embodiment is similar to that of the first embodiment, differences between the first and second embodiments will be mainly described below. - The
video reproducing apparatus 12 of the present embodiment is different from that of the first embodiment in that the apparatus further include a packet selection instructing section 7. - The packet selection instructing section 7 receives selection information Is including the video and audio compression formats of the program that the viewer desires to watch and listen to. Based on the received selection information Is, the packet selection instructing section 7 outputs to the PMT processing section 6 a command Cs for specifying a packet to be descrambled, and outputs to the TS decoder 3 a command Ce including the type of packet to be extracted from the descrambled transport stream TSd. The selection information Is may be supplied from a device outside the
video reproducing apparatus 12, or may be supplied from any component in thevideo reproducing apparatus 12. - In accordance with the command Ce from the packet selection instructing section 7, the
TS decoder 3 extracts the packets from the transport stream TSd received from thedescrambling card 2, and outputs the extracted packets to thevideo decoder 4 or theaudio decoder 5. -
FIG. 5 is a flow chart illustrating an example of the descrambling process executed in the video reproducing apparatus shown inFIG. 4 . - First, upon receiving the selection information Is, the packet selection instructing section 7 outputs the command Cs for specifying the packet to be descrambled to the PMT processing section 6 (Step S201).
- Next, the
PMT processing section 6 processes PMT based on the command Cs from the packet selection instructing section 7. More specifically, thePMT processing section 6 acquires the PMT information Ipmt which is extracted by theTS decoder 3 from the transport stream TSs containing scrambled packets, and extracts only information on the compression format specified by the packet selection instructing section 7 from the acquired PMT information Ipmt based on the identification number stored in advance. - Next, when the scrambled transport streamTSs is inputted into the
descrambling card 2 by the tuner 1 (Step S202), thedescrambling card 2 acquires the processed PMT information IMpmt from the PMT processing section 6 (Step S203). - Next, the
descrambling card 2 executes the descrambling process for the packet containing the identification number defined in the acquired processed PMT information IMpmt in the packet header thereof (Step S204). Thedescrambling card 2 outputs the transport stream TSd containing the descrambled packet to theTS decoder 3. - The video packet Pv and the audio packet Pa outputted from the
TS decoder 3 are reproduced by thevideo decoder 4 and theaudio decoder 5, respectively (Step S205). - Hereinafter, an example of a process of the
PMT processing section 6 will be further described with reference toFIG. 6A andFIG. 6B . -
FIG. 6A is a view illustrating an example of PMT processed by thePMT processing section 6 shown inFIG. 4 . - Hereinafter, for the purpose of simplification, it is assumed a case where the
descrambling card 2 has a capability of simultaneously descrambling two types of packets and where a program desired by the viewer is composed of MPEG2 video and AC3 audio. Additionally, it is assumed a case where the program desired by the viewer is composed of data of MPEG2 video and AC3 (sub). - The packet selection instructing section 7 receives the selection information Is containing the video and audio compression formats of the program that the viewer desires to watch and listen to, and outputs to the
PMT processing section 6 the command Cs for selecting the data compression formats (MPEG2 video and AC3 (sub)) indicated in the received selection information Is. - The
PMT processing section 6 acquires the PMT information Ipmt from theTS decoder 3, and extracts the information on MPEG2 video and AC3 (sub), specified by the packet selection instructing section 7, from the acquired PMT information and generates the processed PMT information IMpmt. - As shown in
FIG. 6A , two types of packets, i.e., MPEG2 video and AC3 (sub-audio), which are associated withidentification numbers descrambling card 2 with respect to two types of packets. -
FIG. 6B is a view illustrating an example of the transport stream received by the descrambling card. - The transport stream TSs shown in
FIG. 6B contains five types of TS packets each having respective theidentification numbers 11 through 13, 15, and 16 in the packet header. As shown inFIG. 6A ,only identification numbers descrambling card 2 has received from thePMT processing section 6. As a result, although thedescrambling card 2 descrambles the TS packets having theidentification numbers identification numbers - Since the conventional video reproducing apparatus instructs the descrambling card to descramble the packet regardless of whether the packets compose the program desired by the viewer, there is a case where the scrambled packets containing, for example the data of AC3 (main-audio) and the data of AC3 (sub-audio) is outputted as they are. In this case, the conventional video reproducing apparatus cannot reproduce the audio data (AC3 (main-audio) and AC3 (sub-audio)) of the program that the viewer has desired. In other words, in the conventional video reproducing apparatus, the resources of the descrambling card is not necessarily allocated for descrambling the packet having the data attribute that the viewer desires to reproduce.
- In contrast to this, in the
video reproducing apparatus 12 in accordance with the present embodiment, the packet selection instructing section 7 receives the selection information Is for selecting MPEG2 video, AC3 (main-audio), and AC3 (sub-audio) desired by the viewer, and thePMT processing section 6 instructs thedescrambling card 2 to descramble the packet informed by the packet selection instructing section 7. As a result, according to thevideo reproducing apparatus 12 of the present embodiment, it is possible to effectively utilize the resources of thedescrambling card 2 for descrambling the required packet, thereby allowing the packets having the audio data (AC3 (main-audio) and AC3 (sub-audio)) of the program, which are desired by the viewer, to be preferentially descrambled. - In the present embodiment, a case where the program, that the viewer desires to watch and listen to, is composed of MPEG2 video and AC3. If the program, that the viewer desires to watch and listen to, is composed of MPEG1 video and MPEG audio, and if the video compression format that the
video decoder 4 can reproduce is MPEG1 video and the audio compression format that theaudio decoder 5 can reproduce is MPEG audio, the packet selection instructing section 7 may output the command Cs to thePMT processing section 6 to select the packets of MPEG1 video and MPEG audio (main). Also in this case, the viewer can watch and listen to MPEG1 video and MPEG audio (main). - The present invention can achieve the video reproducing apparatus allowing the viewer to watch and listen to the video and the audio of the desired program even in the case where the descrambling card has a limit to the number of types of packet which can be simultaneously descrambled. The present invention can be applied to an apparatus for receiving a digital video signal, for example, a digital broadcasting receiver, a set top box, a video cassette recorder, a DVD recorder, or the like.
- While the invention has been described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is understood that numerous other modifications and variations can be devised without departing from the scope of the invention.
Claims (10)
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JP2006111225A JP2007288357A (en) | 2006-04-13 | 2006-04-13 | Image reproduction device |
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Cited By (3)
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US20070237405A1 (en) * | 2006-04-05 | 2007-10-11 | Sharp Kabushiki Kaisha | Image processing apparatus, image forming apparatus, and image processing method |
US20090019499A1 (en) * | 2007-06-26 | 2009-01-15 | Sandeep Singhai | Methods and Apparatus for Improved Program Acquisition for Use with MPEG-2 Based Systems |
US20090193488A1 (en) * | 2008-01-28 | 2009-07-30 | Funai Electric Co., Ltd. | Digital broadcasting receiving apparatus and scramble channel deciding method capable of shortening time required for scramble decision |
Families Citing this family (1)
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RU2011131880A (en) * | 2009-02-23 | 2013-02-10 | Панасоник Корпорэйшн | TV RECEIVER |
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US20050166244A1 (en) * | 2004-01-27 | 2005-07-28 | Moon Kyoung S. | Virtual channel table data structure, transport stream discrimination method, and digital broadcast receiver |
US20090046855A1 (en) * | 2005-05-10 | 2009-02-19 | Kevin Lloyd Grimes | Method and apparatus for caching access information for faster digital cable tuning |
-
2006
- 2006-04-13 JP JP2006111225A patent/JP2007288357A/en active Pending
-
2007
- 2007-04-11 US US11/783,698 patent/US20070245395A1/en not_active Abandoned
Patent Citations (2)
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US20050166244A1 (en) * | 2004-01-27 | 2005-07-28 | Moon Kyoung S. | Virtual channel table data structure, transport stream discrimination method, and digital broadcast receiver |
US20090046855A1 (en) * | 2005-05-10 | 2009-02-19 | Kevin Lloyd Grimes | Method and apparatus for caching access information for faster digital cable tuning |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070237405A1 (en) * | 2006-04-05 | 2007-10-11 | Sharp Kabushiki Kaisha | Image processing apparatus, image forming apparatus, and image processing method |
US7813565B2 (en) * | 2006-04-05 | 2010-10-12 | Sharp Kabushiki Kaisha | Image processing apparatus, image forming apparatus, and image processing method |
US20090019499A1 (en) * | 2007-06-26 | 2009-01-15 | Sandeep Singhai | Methods and Apparatus for Improved Program Acquisition for Use with MPEG-2 Based Systems |
US8634310B2 (en) * | 2007-06-26 | 2014-01-21 | Qualcomm Incorporated | Methods and apparatus for improved program acquisition for use with MPEG-2 based systems |
US20090193488A1 (en) * | 2008-01-28 | 2009-07-30 | Funai Electric Co., Ltd. | Digital broadcasting receiving apparatus and scramble channel deciding method capable of shortening time required for scramble decision |
US8539227B2 (en) * | 2008-01-28 | 2013-09-17 | Funai Electric Co., Ltd. | Digital broadcasting receiving apparatus and scramble channel deciding method capable of shortening time required for scramble decision |
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